基于长序列的黄河下游游荡型河道河势演变

分析黄河下游游荡型河道河势的时空演变规律,为进一步认识黄河下游河道演变特征、开展河道整治提供理论支撑和实践价值。在系统收集、整理1960-2015年黄河下游游荡型河段典型断面的河势观测资料基础上,利用Mann-Kendall趋势检验和Fisher断点检验方法分析1960-2015年黄河下游游荡型河道典型断面多年平均河宽及主流线迁移速率变化情况。结果表明:近60年黄河下游游荡型河道在平面形态上呈藕节状分布,而其主流线调整速率的时空分布规律并不显著;黄河下游于店断面、禅房断面是平面藕节状分布的关键节点,将全河段划分为3段(第一段铁谢至于店断面,河宽均值为1 627m;第二段于店至禅房断面,河宽均值为1 477m;第三段禅房至高村断面,河宽均值为1 074m)。

River regime evolution of the wandering channel in the lower Yellow River based on long sequence

The temporal and spatial evolution law of the wandering river regime in the lower Yellow River was analyzed to provide t heoretical support and practical value for further understanding the evolution characteristics of the lower Yellow River channel. Based on the systematic collection of river regime observation data of typical sections of the wandering channel in the lower Yellow River from 1960 to 2015, with the Mann-Kendall trend test and Fisher break point test method, the average river width and the migration rate of the mainline of the wandering channel in the lower Yellow River from 1960 to 2015 were analyzed. The results show that: in the past 60 years, the wandering channel in the lower Yellow River showed a clear manifestrion, that was, they were distributed in the shape of a lotus on the plane,while the temporal and spatial distribution of the mainline adjustment rate was not significant; the cross section of the lower Yellow River was the key node of the plane lotus-shaped distribution, and the whole river channd was divided into three sections (the first reach,Tiexie-Yudian section, with the average river width of 1627m; the second reach,Yudian-Chanfang section,with the average river width of 1477m; the third reach, Char fang-Gaocun section, with the average river widt h of 1074m, respectively).